The Coffee Creek plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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Coffee Creek’s center stands about 2,530 ft above sea level. Within three miles the land runs from 2,390 ft to 6,020 ft, a difference of 3,630 ft: mountain country. The highest named summit within 15 miles is Caribou Mountain, about 8,420 ft, 14 miles west-southwest.
Under the town center the state geologic map shows Ultramafic rocks, chiefly Mesozoic, unit 1 (Trinity Ophiolite) (peridotite), from the Ordovician, 445 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Peridotite. Age: Ordovician, 445 to 487 million years old. About 9 mi of the line.
Diorite, gabbro. Age: Early Ordovician to Late Ordovician, 455 to 480 million years old. About 8 mi of the line.
Diorite. Age: Jurassic to Early Cretaceous, 100 to 202 million years old. About 4 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Melange. Age: Devonian to Jurassic, 145 to 422 million years old. About 0.3 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Coffee Creek reaches the Pacific Ocean by way of Coffee Creek, the Trinity and the Klamath: about 190 river miles.
Lake on the way: Trinity Lake.
120 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Coffee Creek; river miles along the main stem, rounded.
